

A button will appear asking you to Select Device, and from here choose the device you wish to use to draw your signature.Here a small window will open, press Create Signature and select the iPhone or iPad option.From the Tools drop-down menu, select Annotate and Manage Signatures.Open Preview on your Mac and select Tools from the Menu Bar at the very top of the screen.

How to add a signature to a PDF on a Mac using an iPhone or iPad Preview still offers the option to use the Trackpad to create a signature, or scan a piece of paper which has your signature, though this new option certainly makes annotating a document much easier.
